Apparatus for grinding crank-shafts.



PATENTED SEPT. 3, 1907.

G. BENIGKE. APPARATUS FOR GRINDING CRANK SHAITS.

APPLICATION FILED MAR. 20. 1906.

UNITE STATES GEORG BENICKE, OF OFFENBAOH-ON-THE-MAIhl, GERMANY.

APPARATUS FOR GRINDING CRANK-SHAFTS.

Specification of Letters Patent.

Patented Sept. 3, 1907..

Application filed March 20,1906. Serial No. 307.092.

5 superintending engineer of the firm of Maya and Schmidt, of Lowenstrasse, Offenbach on the Main, Germany,) have invented certain new and useful Apparatus for Grinding (rank-Shafts, of which the follow ing is a specification. I

In the accompanying drawings, Figure 1 is a longitudinalsection of the apparatus, Fig. 2 is a transverse section corresponding to the liners-b of Fig. 1, Fig. 3 is a transverse section corresponding to the line c-d of Fig. 1. Fig. 4 is an end view of the bed of the crank shaft,

5 with the bed plate in section. Fig. 5 shows the method of mounting the oscillating tool-holder, and Fig. 6 is a section through this mounting.

The construction of the apparatus and the method of operating it are as follows.-'

1 Upon the bed plate 1 there are secured by means of screw shafts, 4, longitudinally n iovable carriages 2 and a 3. The screw shaft 4' is actuated by means of a worm wheel 5 keyed thereon, a worm 6 and a shaft 7. The carriages 2 and 3 support vertically movable rests 8 and 9 to which there are attached longitudinally adjustable supporting arms 10 and llwhereunto the crank shaft 12, is firmly attached by suitable means. The crank shaft can thus be adjusted both vertically and parallel to the bed. This is effected by means of screw shafts 13 and 14 provided upon the rests 8 and 9. Each of these screw shafts is furnished at its lower end with a worm wheel 16 which can be rotated by means of a worm 19 that is laterally displaceable'upon theshaft 1'7. When the rests are longitudinally displaced the worms 19, 5 which are so connected by a key and keyway with the shaft 17 that they rotate therewith but are displaceable in the direction of the length thereof, are positively moved along the shaft--17 by laterally projecting arms 20, whereby they are caused to remain in gear with the worm wheel 21, keyed thereon, and a worm 22 upon a shaft 23, Fig. 2. The carriages 2 and 3 can by rotating the shaft 7 be simultaneously moved in the longitudinal direction, but they remain at rest when the shaft 23 is rotated for the purpose of simultaneously raising or lowering the rests 8 and 9. I

' The actual grinding is effected in the manner now to be described by means of an emery cylinder .that moves around the work.

I. A divided ring 24 is arranged upon the bed'l in suchcaused to rotate.

worm wheel 16. The shaft 17 is rotated by-means of a a a manner as to be displaceable in the longitudinal di rection of the bed, (Fig. 3). In this ring 24 there moves an undivided ring-25 provided with teeth which can be slowly rotated by means of a toothed wheel 26, a shaft 39 and a belt pulley 38. On the front of the ring 25 there is mounted upon a rotating part as shown in Figs. 1, 5 and-6 the carrier 28 of the shaft of the grinding wheel which can be displaced by means of supports actuated by the screw shaft 27. The shaft 29 of this wheel is mounted in the carrier 28 and the wheel itself consists of an emery cylinder 30 the front surface of which moves over the part of the crank shaft to be ground whenever the ring 25 and the grinding apparatus are rotated.

For the purpose of enabling the grinding-operation to be inspected and of facilitating the adjustment of the crank shaft, the arrangement is such aslto enable the can rier 28 of, the grinding shaft to assume the position indicated in Fig. 2. This is effected by mounting the carrier 28 upon the rotatable part 35. v

The rotation of the shaft 29 is effected in the following munch-A belt-pulley 31 which is protected against lateral displacement by means of an adjustable ring 32 is rotatably mounted upon an adjustable rim of the ring 25. The belt-pulley 31- is actuated by means of a belt 33 which is restricted at the sides'by means of rims and the breadth of which isless than that of the pulley. Between one of these rimsand the wall of the ring there is placed a cord 34 (Fig. 1) which runs over grooved pulleys 36 and 48 (Fig. 3), which are rotatably mounted on the ring 25, as well as over the disk 37, whereby theemery grinding wheel 30 together with its shaft 29, is

The apparatus is operatedas follows-After the carrier 28 has been turnedaside, the crank-shaft 12 is fixed in position and by rotating the shafts 7 and 13'it is suitably adjusted both longitudinally and vertically,. the

emery cylinder is -thereupon accurately adjusted by means of the screw 27, thecarrier 28 having first been caused to assume its working position. When the apparatus is in operation the emery wheel not only rotates around itsaxis, but also revolves around the work, during this rotation which proceeds at a low speed, the

emery wheel maybe adjusted, While the grinding is being carried out the crank shaft 12-must be moved to and fro over the grinding wheel 30. This is effected by rotating the shaft 7 either by hand, or automatically by means of suitable mechanism... When the accessible portion has been ground the emery wheel 'must be turned aside whereupon the crank shaft isrotated through an angle of 180; laterally adjusted and the emery wheel again caused to assume its operative position.

What I claim as my invention and desire to secure by Letters Patent is.

Apparatus for grinding crank shafts consisting of an emery wheel (30), a rotating open ring (25), upon which the crank shaft 12 is supported, and means for moving the 1() witnesses.

GEORG BENICKE.

Witnesses KARL BRocKMnNN; JEAN GRUND. 

